Abstract
The objective of this research is to provide a better understanding of the relation between the macroscopic and microscopic behaviours of two clayey materials, a kaolinite and a mixture of kaolinite and montmorillonite. At the macroscopic scale, the approach consists of measuring the water content, void ratio and degree of saturation versus suction (s) during drying, which allows to specify the relationship between shrinkage and desaturation and highlights the characteristic phases of behaviour. At the microscopic scale, study of the orientation of the clay particles is carried out by scanning electron microscope (SEM) picture analysis under different suctions. On drying paths, the observations show an isotropy of the microfabric. The evolution of the porosity derived from mercury intrusion porosimetry tests is confirmed by SEM photograph observations.
Résumé
L’objet de cette recherche est d’offrir une meilleure compréhension du lien entre le comportement à l’échelle macroscopique et microscopique de deux matériaux argileux, une kaolinite et un mélange de kaolinite et de montmorillonite. A l’échelle macroscopique, l’approche consiste à mesurer la teneur en eau, l’indice des vides et le degré de saturation en fonction de la succion sur chemin de drainage. Ceci permet de préciser les relations entre le retrait et la désaturation et de mettre en évidence les phases caractéristiques du comportement. A l’échelle microscopique, l’étude de l’orientation des particules d’argile est réalisée par analyse d’images prises au microscope électronique à balayage (MEB). Sur chemin de séchage, les observations montrent une isotropie microstructurale du sol. L’évolution de la porosité est examinée à partir de mesures par porosimétrie au mercure, confirmées par des images seuillées de photos MEB.
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Acknowledgments
This work was supported by the China Scholarship Council (CSC) and the GNR FORPRO project <Fissuration des argiles liée à la desiccation—Couplage des approches macroscopiques et microstructurales>.
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Wei, X., Hattab, M., Fleureau, JM. et al. Micro–macro-experimental study of two clayey materials on drying paths. Bull Eng Geol Environ 72, 495–508 (2013). https://doi.org/10.1007/s10064-013-0513-4
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DOI: https://doi.org/10.1007/s10064-013-0513-4
Keywords
- Clays
- Isotropy
- Scanning electron microscope
- Mercury intrusion porosimetry
- Shrinkage
- Suction
- Soil structure